﻿// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
// Copyright (c) 2011, Dr. Masroor Ehsan
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of the author nor the
//       names of its contributors may be used to endorse or promote products
//       derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 
//  $Author:$
//  $Id:$
//  $Rev:$
// 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

using System.Collections.Generic;
using MaxTrader.BusinessObjects.Dao;

namespace MaxTrader.DAL.Dao.NHibernate
{
    public class NHibernateDao<T> : IDao<T> //where T : Entity
    {
        #region IDao<T> Members

        public void Save(T t)
        {
            InternalSaveUpdateDelete(t);
        }

        public void Update(T t)
        {
            InternalSaveUpdateDelete(t, true);
        }

        public void Delete(T t)
        {
            InternalSaveUpdateDelete(t, false, true);
        }

        public T Read(int id)
        {
            return NHibernateHelper.OpenSession().CreateCriteria(typeof (T)).UniqueResult<T>();
        }

        public IList<T> FindAll()
        {
            return NHibernateHelper.OpenSession().CreateCriteria(typeof (T)).List<T>();
        }

        #endregion

        private static void InternalSaveUpdateDelete(T obj, bool saveOrUpdate = false, bool delete = false)
        {
            var session = NHibernateHelper.OpenSession();
            using (var trans = session.BeginTransaction())
            {
                try
                {
                    if (delete)
                    {
                        session.Delete(obj);
                    }
                    else
                    {
                        if (saveOrUpdate)
                        {
                            session.Save(obj);
                        }
                        else
                        {
                            session.SaveOrUpdate(obj);
                        }
                    }
                    trans.Commit();
                }
                catch
                {
                    trans.Rollback();
                    throw;
                }
            }
        }
    }
}